Regarding the recent census in the United States, there was much debate about the racial classification of 'Hispanics'.

Is 'Hispanic' a race? In short, no. 'Hispanic' is a cultural designation but New World Hispanics can be broken down into racial categories, such as mestizo or Amerindian.

Are New World Hispanics white? Most often, no, they are not white.

Although the traditional meaning of 'Hispanic' related to those from Spain and white Hispanics do exist in Latin America (esp. in Argentina), many of the Hispanics in the New World have little, or no, Spanish ancestry, especially those immigrating to the United States.

Since the unspoken purpose of the American census was to find out how many non-Westerners (i.e. non-whites) were living in the US, perhaps a better classification (as others have pointed out) would be:

MAMBs: mestizos, Amerindians, mulattos & blacks from Latin America.

Other than Argentina (and possibly Chile) much of Latin America and the Caribbean seems to be populated by MAMBs.

Most Latin American countries seem to have large percentages of non-Europeans. For instance, Brazil is almost 50% black / mulatto; Columbia is 58% mestizo and 14% mulatto; and Guatemala is more than 90% Amerindian and mestizo.

According to the CIA World Fact Book, Mexico is:
60% mestizo
30% Amerindian
Less than 10% European (mostly Spaniard)

And what is the ancestry of mestizos? Examining genetic ancestral markers, Rubén Lisker found the average admixture of a lower-income mestizos in Mexico City to be:

59% Amerindian
34% European [mostly Spaniard]
and 6% black

As Richard Lynn points out in "Pigmentocracy: Racial Hierarchies in the Caribbean and Latin America," most Latin American countries seem to have an extremely small upper-class of Europeans, and below it very large masses of Amerindians, mestizos, mulattos and blacks.

And most of the people immigrating to the United States from Latin America are from the lower, non-European classes, especially from Mexico.

Furthermore, if you figure the average European or Diaspora European IQ to be around 102 - 103, it becomes apparent that MAMBs fall below.

Average black IQ: 75
Average mestizo IQ: 82

Average IQs of some Latin American countries:

Equador: 80
Guatemala: 79
Mexico: 87
Puerto Rico: 84

Because of this lower IQ immigration from Mexico, Latin America and elsewhere, Byron M. Roth, in The Perils of Diversity: Immigration and Human Nature, estimates that

[The] average American IQ will decline from 98 to 95 by mid-century. This may seem a small drop, but it will have dire effects for elites, because the percentage of Americans with an IQ of at least 120 will fall from 7.1 to 4.8. [Summary by Lynn.]

It seems, in conclusion, that most New World Hispanics arriving in the United States vary by race (are MAMBs) but clearly are non-Western (i.e. are non-white, i.e. are non-Diaspora European) and probably fall below Westerners in intellectual ability.

Here's a listing of dog IQs by breed. Dogs have undergone artificial selection, so those selected for intelligence (Border Collie) tend to be very smart, while those selected only for appearance tend not to be so smart. It depends on what was being selected for. A bloodhound typically has a low dog IQ (doesn't respond well to commands) but has undergone intense selection for smelling ability, so a bloodhound compensates for lack of command response with a keen sense of smell.

Many have argued that mutts tend to be around average intelligence, depending on their ancestry. A mutt of high IQ ancestry (for example, a Border Collie, German Shepherd & Golden Retriever mix) will be smart, but a mutt of low IQ ancestry (for example, a Chow Chow, Basenji & Pekingese mix) will tend to be dumb.

A veterinarian reader tells me that most mutts today in urban areas are at least part pit bull terrier. Given that pit bulls have low dog IQs, this would mean that the average IQ of mutts would be on the lower end of the spectrum. (N.B. that pit bulls also have undergone recent heavy artificial selection for aggression, since they're often raised to fight.)

It should also be noted that pariah dogs (mutts in the wild that have reverted back to wolf-like characteristics) tend to have low average dog IQs, as by dog IQ one means a dog's responsiveness to human commands. Mutts, left alone for multiple generations, will develop pariah traits and eventually will lose traits of domestication, which means their dog IQ will drop.

It should be noted, however, that what we think of as dog intelligence (response to commands) is not all that dog breeds underwent artificial selection for. For instance, breeds were selected for guarding, hunting, smelling, herding, appearance, etc., and each breed seems to have its own special abilities or appearance. Breeds are important. If dog breeds were to disappear and be transformed into a large class of mutts, we would lose the richness of canine biodiversity.

From The Intelligence of Dogs, by S. Coren

Ranks 1 to 10
Brightest Dogs

Understanding of New Commands: Less than 5 repetitions.
Obey First Command: 95% of the time or better.